discourse/db/migrate/20130426044914_allow_nulls_in_incoming_links.rb

class AllowNullsInIncomingLinks < ActiveRecord::Migration[4.2]
  def change
    change_column :incoming_links, :referer, :string, limit: 1000, null: true
    change_column :incoming_links, :domain, :string, limit: 100, null: true
  end
end